We've EBS R12.2 with DB version 12.1 ,can I encrypt DB 12.1 using TDE Tablespace online ?
(Doc ID 2559570.1) explain how to enable TDE Tablespace Online Encryption of Oracle E-Business Suite Release 12.1 and 12.2 for databases ,
as my understand it's for 19c only
section 2 : prerequisite , Ensure the COMPATIBLE database parameter is set to the appropriate database version,19.0.0
Using Fast Online Conversion to Enable Transparent Data Encryption (TDE) for Oracle E-Business Suite (Doc ID 2559570.1)